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Tunable Kondo screening in a quantum dot device

Hiroyuki Tamura and Leonid Glazman
Phys. Rev. B 72, 121308(R) – Published 23 September 2005

Abstract

We consider electron transport along a single-mode channel which is in contact, via tunnel junctions in its walls, with two quantum dots. Electron tunneling to and from the dots contributes to the electron backscattering, and thus modifies the channel conductance. If the dots carry spin, the channel conductance becomes temperature dependent due to the Kondo effect. The two-dot device geometry allows for a formation of S=1 localized spin due to the indirect exchange interaction, called Ruderman-Kittel-Kasuya-Yosida interaction. This device offers a possibility to study the crossover between fully screened and underscreened Kondo impurity. We investigate the manifestation of such crossover in the channel conductance.

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  • Received 3 June 2005

DOI:https://doi.org/10.1103/PhysRevB.72.121308

©2005 American Physical Society

Authors & Affiliations

Hiroyuki Tamura1,2 and Leonid Glazman3

  • 1NTT Basic Research Laboratories, NTT Corporation, Atsugi, Kanagawa, 243-0198 Japan
  • 2CREST-JST, 4-1-8 Honmachi, Kawaguchi, 331-0012, Japan
  • 3Theoretical Physics Institute, University of Minnesota, Minneapolis, Minnesota 55455, USA

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Issue

Vol. 72, Iss. 12 — 15 September 2005

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